JP4534284B2 - Edge wiper device for coating machine and method for adjusting non-coating width thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an edge wiper device of a coating machine that applies a liquid onto paper or the like via a roll and a method for adjusting the non-coating width thereof.
[0002]
[Prior art]
In the coating machine, a coating solution (paint, starch, clay, etc.) is applied to both sides or one side of a sheet such as paper, and the sheet is subjected to surface treatment (improvement of strength and smoothness). In this case, as illustrated in FIG. 5, the sheet S is passed between the pair of applicator rolls 1, and the coating liquid is applied between the metering roll 2 that contacts the applicator roll 1 and the outer roll 3 that contacts this. Is supplied from the metering roll 2 to the surface of the applicator roll 1.
[0003]
Further, the coating liquid is applied to both sides of the metering roll 2 for supplying the coating liquid to the roll 1 so that the coating liquid can be applied to the surface length of the applicator roll 1 corresponding to the width of the sheet S passing therethrough. A wiper 4 for adjusting the width is arranged. The wiper 4 removes both sides of the coating liquid applied to both sides of the metering roll 2 from the roll surface, and the coating liquid is applied to the surface of the applicator roll 1 with a defined width.
[0004]
In the coating width adjusting wiper described above, it is difficult to maintain the pressure contact force in an appropriate state due to the wear of the blade edge of the blade 5 in contact with the roll 1 and difficulty in fine adjustment of the pressure contact force. was there. Therefore, a coating width adjusting wiper that enables fine adjustment of the pressure contact force has been proposed (Japanese Patent Laid-Open No. 6-269712). As shown in FIG. 6, the coating width adjusting wiper includes a blade 5 in which the wiper 4 is pressed against the roll surface 2a and a holder 6 that holds the blade 5. The holder 6 is a blade holding member. 7 and the support mechanism 8, and the pressure contact force between the blade 5 and the roll surface 2 a is adjusted by expansion and contraction of the air tubes 9 a and 9 b constituting the support mechanism 8.
[0005]
[Problems to be solved by the invention]
In the conventional coating width adjusting wiper described above, there is only a fixed edge wiper whose position can be manually adjusted in the width direction, or a device that periodically slides within a specified width for the purpose of preventing uneven wear of the wiper. It wasn't.
[0006]
That is, since the conventional coating width adjusting wiper only slides in a width fixed or determined in the width direction, a relative distance cannot be maintained with respect to the edge (end face) of the paper whose position changes. For this reason, as shown in FIGS. 7B and 7C, when the edge position changes due to the meandering of the paper or the expansion and contraction of the paper, the conventional coating width adjusting wiper cannot cope with the change and the edge of the paper and the coating portion. (The uncoated width b of the edge portion) cannot be kept constant. Therefore, as shown in (B), the uncoated width becomes excessively small (the coating width is excessively large), and the coating liquid adheres to the back side of the paper, contaminates the roll, or causes a paper break due to excessive liquid at the edge portion. Will occur. On the other hand, when the uncoated width b is too large (the coated width is too small) as in (C), over-drying of the non-coated part (dry edge) occurs during drying in the subsequent process, and the paper is cut. Cause it to occur.
[0007]
In order to prevent paper meandering, conventionally, (1) restraining the front and back of the paper to nip, (2) adjusting the linear velocity and tension, (3) tilting a part of the roll has been adopted. Has been. These means, in particular, means for tilting a part of the roll to prevent meandering are effective and highly accurate, but difficult for large paper widths (for example, 3 m or more), are prone to wrinkles, and have poor operability. . Further, the meandering prevention means is generally large and costly. Further, when the paper expands and contracts, the uncoated width of the edge portion changes even if the meandering is suppressed.
In the post-process, the uncoated width portion is trimmed to make the product width constant. Therefore, if the uncoated width is kept constant, there is no problem even if the coating width itself changes.
[0008]
The present invention has been developed to solve the above-described problems. That is, an object of the present invention is to provide an edge wiper device of a coating machine and an uncoated width adjustment method thereof that can keep the uncoated width of the edge portion constant even when the paper meanders or expands and contracts. is there.
[0009]
[Means for Solving the Problems]
According to the present invention, an edge wiper device of a coating machine that applies a coating solution to paper or the like via a roll,
A pair of edge sensors (12) for detecting edge positions (11a) at both ends of paper or the like (11), a pair of wipers (14) for contacting the roll (13) and removing the coating liquid, and wipers A pair of wiper moving devices (16) that move the paper in the width direction of paper and the like, and a controller (18) that controls the wiper moving device according to the detection position by the edge sensor,
By the controller (18), to detect both ends of the edge position of the paper or the like (11a) by a pair edge sensor, the wiper of one for each edge position is located relatively fixed position, thereby paper There is provided an edge wiper device for a coating machine, characterized by controlling a pair of wiper moving devices so that the non-coating width of the edge portions at both ends is constant even when the wire meanders or expands and contracts.
[0010]
Moreover, according to the present invention, there is provided a non-coating width adjusting method for a coating machine for applying a coating liquid to paper or the like via a roll,
Edge positions (11a) at both ends of paper or the like (11) are detected, and one wiper (14) is moved to a fixed position with respect to each detected edge position, whereby non-coating widths at both ends are detected. A method for adjusting the non-coating width of a coating machine is provided.
[0011]
According to the apparatus and method of the present invention described above, the edge position (11a) of the paper or the like (11) is detected by the edge sensor (12), and the wiper (14) is relative to the edge position detected by the controller (18). Therefore, even when the paper or the like meanders or expands or contracts, the wiper (14) can be kept relatively constant with respect to the edge position, and the uncoated width of the edge portion can be kept constant.
That is, the position of the paper edge with respect to the machine is detected by the sensor, and the position of the wiper is controlled in the width direction by the motor or actuator so that the distance from the paper edge is constant. By this control, the coating width (uncoated width of the edge portion) with respect to the paper edge is kept constant. This keeps the ideal coating width to prevent roll stains and paper breakage due to the back of the paint due to excessive coating width, and paper breakage due to drying of the non-coated part when the coating width is too small. Can be improved.
[0012]
According to a preferred embodiment of the present invention, the edge sensor (12) comprises a projector (12a) and a light receiver (12b) facing each other across the edge position, and an optical type for detecting the edge position based on the output of the light receiver. The wiper moving device (16) is an edge sensor, and includes a linear guide (16a) that guides the wiper (14) so as to be movable in the width direction, and an actuator (16b) that moves the wiper in the width direction.
With this configuration, the edge position of the paper or the like can be detected in a non-contact and real-time position by the optical edge sensor, and this is fed back to the actuator (16b), and the wiper (14) is moved in the width direction by the deviation from the set value. By moving to, control delay can be minimized.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In each figure, common portions are denoted by the same reference numerals, and redundant description is omitted.
FIG. 1 is a configuration diagram of a coating machine provided with an edge wiper device of the present invention. In this figure, this coating machine conveys the paper 11 etc. from the roll 22a to the roll 22b via the guide rolls 23a, 23b, 23c, 23e, and a pair of applicator rolls arranged between the rolls 23b, 23c. The coating liquid is applied to the paper 11 or the like between 21 and 21. Here, 10 is an edge wiper device of the present invention, and 20 is a coating liquid coating device. In this example, the coating liquid is directly applied to the applicator roll 21 and the edge portion of the coating liquid is removed by the edge wiper device 10, but the present invention is not limited to this, As illustrated in FIG. 5, the coating liquid is supplied between the metalling roll 2 that contacts the applicator roll 1 and the outer roll 3 that contacts the applicator roll 1, and the edge portion of the coating liquid is removed from the metalling roll 2. You may arrange as follows.
[0014]
2 is an AA arrow view of FIG. 1, and FIG. 3 is an enlarged view of part B of FIG. As shown in FIGS. 2 and 3, the edge wiper device 20 of the present invention includes an edge sensor 12, a wiper 14, a wiper moving device 16, and a controller 18.
The edge sensor 12 includes a light projector 12a and a light receiver 12b facing each other across the edge position 11a. The edge sensor 12 detects the edge positions 11a at both ends of the paper 11 or the like based on the output of the light receiver 12b, and an analog or digital signal corresponding to the position. Is output to the controller 18.
The wiper 14 is a well-known coating width adjusting wiper, and contacts the roll 13 to remove an edge portion of the coating liquid applied to the roll.
[0015]
The wiper moving device 16 includes a linear guide 16a that guides the wiper 14 so as to be movable in the width direction, and an actuator 16b that moves the wiper 14 in the width direction. The actuator 16b is a hydraulic cylinder in this example, but may be a combination of a ball screw and a servo motor.
[0016]
The controller 18 controls the wiper moving device 16 according to the detection position by the edge sensor 12, and the wiper 14 is positioned at a fixed position relative to the edge position 11a.
That is, in the non-coating width adjusting method of the coating machine according to the present invention, the edge position 11a of the paper or the like 11 is detected by the edge sensor 12, and the wiper 14 is moved to a relatively fixed position with respect to the detected edge position 11a. Thus, the non-coating width b is kept constant.
[0017]
FIG. 4 is a diagram for explaining the operation of the present invention. According to the apparatus and method of the present invention described above, the edge position 11a of the paper 11 or the like is detected by the edge sensor 12, and the wiper 14 is moved to a fixed position relative to the edge position 11a detected by the controller 18. 4B and 4C, even when paper or the like meanders or expands or contracts, the wiper 14 is kept relatively constant with respect to the edge position 11a, and the uncoated width b of the edge portion is kept constant. Can do.
[0018]
That is, the position of the paper edge 11a with respect to the machine is detected by the sensor 12, and the position of the wiper 14 is controlled by the motor or actuator in the width direction so that the distance from the paper edge is constant. With this control, the coating width (the uncoated width b of the edge portion) with respect to the paper edge can be kept constant.
[0019]
It should be noted that the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.
[0020]
【The invention's effect】
As described above, the edge wiper device of the coating machine and the non-coating width adjusting method of the present invention can keep the uncoated width of the edge portion constant even when the paper meanders or expands and contracts. Excellent effects such as preventing roll stains due to the back of the paint due to excessive coating width, paper breakage, and paper breakage due to drying of the non-coated part when the coating width is too small, improving operability, etc. Have
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a coating machine provided with an edge wiper device of the present invention.
FIG. 2 is a view taken in the direction of arrows AA in FIG.
FIG. 3 is an enlarged view of a part B in FIG. 1;
FIG. 4 is an operation explanatory diagram of the present invention.
FIG. 5 is a schematic diagram of a conventional coating machine.
FIG. 6 is a configuration diagram of a conventional wiper for coating width adjustment.
FIG. 7 is an operation explanatory diagram of a conventional coating width adjusting wiper.
[Explanation of symbols]
1 applicator roll, 2 metering roll, 2a roll surface,
3 outer rolls, 4 wipers, 5 blades, 6 holders,
7 Blade holding member, 8 Support mechanism, 9a, 9b Air tube,
10 edge wiper device, 11 paper, 11a edge position,
12 edge sensor, 12a projector, 12b receiver, 13 roll,
14 wiper, 16 wiper moving device, 16a linear guide,
16b Actuator, 18 Controller, 20 Coating liquid application device,
21 Applicator roll, 22a, 22b roll,
23a-23e Guide roll

Claims (3)

An edge wiper device for a coating machine that applies a coating solution to paper or the like via a roll,
A pair of edge sensors (12) for detecting edge positions (11a) at both ends of paper or the like (11), a pair of wipers (14) for contacting the roll (13) and removing the coating liquid, and wipers A pair of wiper moving devices (16) that move the paper in the width direction of paper and the like, and a controller (18) that controls the wiper moving device according to the detection position by the edge sensor,
By the controller (18), to detect both ends of the edge position of the paper or the like (11a) by a pair edge sensor, the wiper of one for each edge position is located relatively fixed position, thereby paper An edge wiper device for a coating machine, wherein the pair of wiper moving devices is controlled so that the non-coating width of the edge portions at both ends is constant even when the wire is meandering or expanding and contracting. The edge sensor (12) is an optical edge sensor that includes a projector (12a) and a light receiver (12b) facing each other across the edge position, and detects the edge position by the output of the light receiver.
The wiper moving device (16) includes a linear guide (16a) for guiding the wiper (14) so as to be movable in the width direction, and an actuator (16b) for moving the wiper in the width direction. Item 2. The edge wiper device according to Item 1. A non-coating width adjusting method for a coating machine that applies a coating liquid to paper or the like via a roll,
Edge positions (11a) at both ends of paper or the like (11) are detected, and one wiper (14) is moved to a fixed position with respect to each detected edge position, whereby non-coating widths at both ends are detected. A method for adjusting the non-coating width of a coating machine, characterized by maintaining a constant value.

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